ISO 7404-4:2017

Methods for the petrographic analysis of coals — Part 4: Method of determining microlithotype, carbominerite and minerite composition

Publication date: 9 gush 2017

General information

Current stage: 90.92 Effective date: 20 maj 2023

Originator: ISO

Owner: ISO/TC 27/SC 5

Type: International Standard

ICS: 73.040

Gjuha: anglisht

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Statusi: Publikuar

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Scope

ISO 7404-4:2017 specifies a method, using a graticule with 20 crossline intersections, for determining the proportions of microlithotypes, carbominerite and minerite in coals. It applies only to determinations made on polished particulate blocks using reflected white light (about 400 nm to 700 nm). Additional blue, blue-violet or UV light excitation (365 nm to 440 nm) for better identification of liptinite in fluorescence may be used especially at low rank coals.

Life cycle

PREVIOUSLY

Revises
ISO 7404-4:1988

NOW

PUBLISHED
ISO 7404-4:2017
90.92 Standard to be revised
20 maj 2023

REVISED BY

IN_DEVELOPMENT
ISO/CD 7404-4

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